The correct answer is "All of these are correct."
Reptiles and amphibians share several traits:
- They have limbs: Both groups have evolved limbs for movement (though the structure and use of limbs can vary greatly).
- They have gills: While this is primarily a trait found in amphibian larvae (like tadpoles), adult amphibians can also have gills. Some early aquatic reptiles and certain reptiles during their juvenile stages exhibit similar features.
- They lay eggs with shells: Reptiles lay eggs with hard or leathery shells, while amphibians typically lay eggs in water, which lack shells but there are some variations.
Thus, all the provided statements recognize traits that might relate to both groups in different contexts.